Railroad truck



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E. G'. CHANDLER RAILROAD TRUcx 2 sheets-sheet 1 ld Dac. 14 1922 oct. 1e, '1923. www@ Y E. G. CHANDLER v RAILRQAD TRUCK 1 File'd Dec. 14, 1922 2 Sheets-Sheet 2 jot-Emmen G.:oHANnLER onommmn-'foREGoN.

. fRAKILRoAn rnUoK.

the torque fibot'fthose Teines extending 'between the d'agoneglly flocjted Wheels.y In other Words: referring' t'o'itbe 'diagram-Figi? of the accompanying drawings 'If the Wheel af, passed over e y#spot jwhieh wasislightly lowerthen the surfaces euppo'tinglthe other Whee1s,theentre weight ieerriedyby 'the y tlj'uekrlwouldbe snppoted for'ttbtt nstentfby the Wheels fandb. ndthe-"f1ame would ber Jdistote'd and Wrenehed nabout jthefaxs dp-wfg.ortiiftbewheel af ,were the onepessing. `over 'the (lower vpoint, "the Wheels d .and 59;. bevould supportthe entire weight-.and the truck Vvframe Would bedsto'rted bont the einem, we; and sue'hedisterton -and wrenching tend's'to spng or ruptnre'theitpuclframe. "The 'object-of mynv'enton is,".`the`refore, f tojprovide'fa .truck iframe -v'v-hehgis ,adapted l tofttfke care of the sd con dtion Withouti-njnijy'tothetrnekfframd` attain my 'objet in gtrl'ek eomposed of an 'Hfsh'eped Wheelv mounted 'base or' frameJ7 gwtwo' lfggd lside. members lcon- 1 connected.

55 lis e Vplan View of avlogging truck 'Tbesennges T, cross seetlone-n ends.

A f, tege-53 e i with. pertsibroken; :to 'llnstrntel y j isp e .side 4elevation with pants broken' Y wey lto slowldetalle ef construction `Atherv plane-of melon Lbemg .epplexlmetelylndfl E1fg.fk.s ze. ,perspective V'View .ofy thee soeket hlo. the Ypvoted Aeonneetomby which l#the bolstenis frames.; M l Fig. V5 shows the .oep,Whichltsffover thek end of. .the .bolster and 4dnas ratrunnon; Jportion which" .is adapted gtoft. 17in the socket ShoWnMinFigAjj frames. may, ,be noteted .'n releten; `toi. eaeh otbemand j f .lFigL 7. is e. degiammate lview/0I" Ithe.. H-

shaped frame in my-loggngftruck.' u

".The tnuek .embodying 'invention his made up of ed'effremeslY wbehngtreecom neeted, together a .tensvverseload earrysupported between these sidemembe-rs onen exis extending tmnsverselif4 tbm the \1ongi. tudinal .middleof tbefsdefflamesf Thefsde frames .and thefibolstereonsttuted subetantmlly an HShaped frame. f andY eelryythe en'- tiredoad suppone-ted,.bytheinneln The side ymembers. bavej pedestzt1 "eestingsv3 .which f are mounted. .ontheelde fra-mes l. '-Boxmge alsotofonm pletfolm enytopiof tbextnuok.

to the b fristen and ,Y side..fmembe125 .and kthus the members notate. 4slightly.gzi'bout'the p'ote'd connections with tbeffbol'ster. .The bostel is preferably proyded WitheeepBon atene. end butfis `:pfefeebly Qpvotedget both The capfgha's,Letmmionl pontionvg which;syptferebly made hollow' With t ribs is fastened to one or both'of ythe ,s idefremee 1,`whichever the case might be, andis adapted to receive the trunnion 9 as shown in` he .trunnion 9 is held in its seat in the socket 11 bythe bolt 13 being fastened thru their middles and thrudthe side member thus tending to prevent the pivoted connections from being forced out of their relative posi The bolster is preferably made of two channel or I-beam sectionsQaAwhich are fas'-k 'tened together in spaced'relationship thru the caps V8, the inner surfaces ofthese strucf tural members'Z.a being fastened to the outsidev of the caps, 8. Thel ordinary truck bunk 12 bearson the approximate middlek of the bolster and the entire load carried by the truck is Avtherefore transmitted to vthef out eXcept for my invention and therefore the parts which go to make up the truck. are

not claimed nor described. Y f The relationship of the separate parts an members to each other are as follows: The

iload carried by the truck is supported sub-v stantially in its entirety by the bunk 12 which in turni's supported vby the transverse load carrying member or bolster. The bolster is pivotally connectedto one or both eide'frames which are inturn supported by 'the wheels on the track. f As long as the wheels are all in the same horizontal pla-ne i the load carried by the truck is equally sup ported byr eachv of the four wheels. 1f, however, one of the wheels strikes a depression in the track the load will not at that instant be supported by this wheel. Ordinarily if lthe frame were rigid the load would be carried by two of the remaining three wheels which arelo'cated at the ends of the frame diagonally opposite each other. Thus forinstance in Fig. `7, if the wheel a were passing over a section of the track slightly lower Vthan the sections over which the wheels and b were vpassing the load would befcarried at that,V instant by the wheels aand o. The ends of the frame su Y ported by. the U wheels a and b wou d Y to'fs'upport an equal load tothe load sup# i Lso then tend to sag until they would tend ported by thev wheels a and b. This would cause a slight'distortion about the line -a",

across the frame. andr this repeated strain would after a time y cause a fracture of three wheels, that wheel is 4free to' move downward with the track because vthe side frameis allowed to rotate relatively yto the opposite side frame and therefore all of the load will be supported between the side members at-`r a'pproxima'tely' their llongitudinal middle so that the distances a and a in Fig. 7 are substantially equal and thus the depressinglof. any. of: thev wheels has an equal eect Yto produce this rotation. The structural members 7 and 7a do not tend to resist this rotation because they are relatively light'in" crosssection and are in no means load. carrying members butare merely yties to hold theends of theside Vfra-mes in spaced relationship. The axles also do not act as connections between the sidemembers but are journaledin boxes which' have la slidable relationship withvthe sidek frames. Thus the axles, also,` donot tend to resist the rotation `about the pivoted connection between the 'bolsters and theside frames.v It is to be understood that one side onlyof the bolster may be pivotallyc'onnected*with one side frame and the other liked to the .opposite frame. This vwould permit the side frames to rotate fin relation to each' other, almost as well in practical -operation as when the bolster is pivoted fat both ends.

Iclaim; 1. In a truck, 'a wheel-mounted frame, )comprising two rigid side members, transverse members connecting the side `members at their ends, a transverse load-carrying member connecting the side members at their longitudinal middle, member having one of its endspivotally connedtedtothe adjacentyside member,

thereby permitting the' rotation of said side; members, relatively to each other, about the longitudinal aXis of said load-carrying member, said transverse end members being adapted to accommodate the said rotation of said side members.,k v

2. In` a truck, a lwheel-mounted frame, comprising `two rigid side members, angle irons connecting the side membersvat ytheir gends, :a transversel'load-carrying 4member connecting the side members at their longi# tudinal middle, said load-carryingmember having one of its ends pivotally connected to the adjacent side member, ythereby permitting therotation of said side members, relatively to each other, about the longitudinal axis of said load-carrying member, said angle irons being adapted to accommodate the said rotation of said side members.

3j In-a truck, a wheel-mounted Yfra-me,

comprising two rigid side* members, trans` verse members connecting the side members atl their ends, a transverse rloz'id-carrying member connecting the side @members at their longitudinal middle, one endY of the load carrying member and the 'adjacent side member being providedwith anvsockety and trunnion respectively thereby permitting the Y rotation. of said side. members, relatively to said load-carrying each other, said transverse end members be` ingfadapted to accommodate the said* rota-V tion of said side members.

4. In a truck, a wheel-mounted `frame,

comprising two rigid. side members, transverse members conneetingthe side membersl at 'their ends, a transverse load-carrying member connect-ing the side members at their Y longitudinal middle, a socket plateprovided Y ing member being provided vWith a trunnion bearing in said socket thereby ypei-mitting the rotation of said side members, relatively to each other, said transverse end members--beingadapted to accommodate the v said rotationof saidV side members.

ELBERTKG. CHANDLER. 

